Sulfuric Acid → Calcium Sulfate

HRID 514653

Reaction equation

HRID 514653 reaction equation
C(=O)([O-])[O-].[Ca+2:5].[Ca].S(CCS(O)(=O)=O)(O)(=O)=O.[S:17]([CH2:21][CH2:22][OH:23])([OH:20])(=[O:19])=[O:18].[S:24](=[O:28])(=[O:27])([OH:26])[OH:25]>O>[S:24]([O-:28])([O-:27])(=[O:26])=[O:25].[Ca+2:5].[S:17]([CH2:21][CH2:22][OH:23])([O-:20])(=[O:19])=[O:18].[Ca+2:5].[S:17]([CH2:21][CH2:22][OH:23])([O-:20])(=[O:19])=[O:18]

Participants

8

Reactant 5

HCID 1118Sulfuric AcidHCID 7866Isethionic AcidHCID 80321,2-Ethanedisulfonic AcidHCID 10112Calcium Carbonate2×HCID 5460341Calcium

Product 2

HCID 24497Calcium SulfateHCID 18784326Calcium isethionate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

If calcium carbonate is used as a source of calcium, the sequence of addition needs to be altered. After ethionic acid is diluted with water and hydrolyzed into isethionic acid and sulfuric acid, calcium carbonate is carefully added the aqueous solution to form a slurry of calcium sulfate and calcium isethionate. Then calculated or excess amount of alkali metal sulfate is introduced into the reaction system to replace calcium in calcium isethionate with alkali metal in alkali metal sulfate.

Workup

  1. additionthe sequence of addition needs
  2. additionis carefully added the aqueous solution

Sources & evidence

ORD record
ord-1a4b8eb569d64c58ade33933be02544e
Source dataset
uspto-grants-2015_08
Patent number
US09108907B1

Linked notes

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